# PRO.FILE FLEX vs SIMATIC Unified Air

The clearest difference is update cadence: PRO.FILE FLEX at every 4 months against SIMATIC Unified Air's every 12 months. PRO.FILE FLEX also leads on iOS requirement (11.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PRO.FILE FLEX ships an update every 4 months, SIMATIC Unified Air every 12 months. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | PRO.FILE FLEX | SIMATIC Unified Air |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 12 months |
| Size | 83 MB | 52 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PROCAD GmbH & Co. KG](https://appshunter.io/developer/452225445) | [Siemens AG](https://appshunter.io/developer/394503271) |

## What reviewers say

### PRO.FILE FLEX

[App page](https://appshunter.io/ios/app/profile-flex/id1593399541)

**In-app purchases:** none


### SIMATIC Unified Air

[App page](https://appshunter.io/ios/app/simatic-unified-air/id6476095253)

**In-app purchases:** none


## Frequently asked questions

### Is PRO.FILE FLEX free?

PRO.FILE FLEX is free to download, with no in-app purchases.

### Is SIMATIC Unified Air free?

SIMATIC Unified Air is free to download, with no in-app purchases.

### Do PRO.FILE FLEX or SIMATIC Unified Air have ads?

Neither PRO.FILE FLEX nor SIMATIC Unified Air shows ads.

### Which is updated more often, PRO.FILE FLEX or SIMATIC Unified Air?

PRO.FILE FLEX ships an update every 4 months, and SIMATIC Unified Air every 12 months. Most recently, PRO.FILE FLEX was updated on October 3, 2026 and SIMATIC Unified Air on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*